Hurricane
Well-known member
I rigged a couple of those on my radar scanner. Somewhere, I have a photo of a seagull with his head close up listening to one of them.I tried one of those ultrasonic emitters, but 43% of the population can actually hear them. Neighbouring boat owners were disturbed, so I abandoned the use of it. It did not have much effect on the seagulls!
The ultrasonic scares that I bought had a setting to scare bears. We don't get many bears in our marina so maybe the bear setting works! But the bear setting didn't frighten the seagulls.